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Built 2026-10-19 (19 October 2026)

Hong Kong Observatory Threshold Days by Year (CHM00045005)

6 fixed thresholds counted per year at Hong Kong Observatory (CHM00045005): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hong Kong Observatory Thresholds

  • Hong Kong Observatory: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 1977 with 141.
  • Hong Kong Observatory: days with a maximum temperature at or above 90 F (32.2 C) in 29 years, most in 1962 with 78.
  • Hong Kong Observatory: days with a maximum temperature at or above 35 C (95 F) in 11 years, most in 1954 with 2.
  • Hong Kong Observatory: nights with a minimum temperature at or above 20 C (68 F) in 5 years, most in 1952 with 212.
  • 6 fixed thresholds have at least one qualifying day at Hong Kong Observatory.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Hong Kong Observatory Days per year at Hong Kong Observatory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 141 in 1977. 0501001501947: 851948: 941949: 1131950: 971951: 871952: 981953: 1071954: 1161959: 981960: 981961: 1021962: 1181973: 1171974: 1321975: 1081976: 941977: 1411978: 1151979: 1041980: 1131981: 951984: 901985: 891986: 1001987: 811988: 981989: 961990: 861991: 1141947195019531960197319761979198419871990
Days per year at Hong Kong Observatory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 141 in 1977.
Days at or above 30 C (86 F) per year at Hong Kong Observatory
YearDaysDecade average
19478597.3
19489497.3
194911397.3
195097100.5
195187100.5
195298100.5
1953107100.5
1954116100.5
195998100.5
196098106
1961102106
1962118106
1973117115.9
1974132115.9
1975108115.9
197694115.9
1977141115.9
1978115115.9
1979104115.9
198011395.3
19819595.3
19849095.3
19858995.3
198610095.3
19878195.3
19889895.3
19899695.3
199086100
1991114100
First to last qualifying date each year at Hong Kong Observatory For each year, a bar from the first to the last day at Hong Kong Observatory meeting 30 C (86 F). 1947: 2 May 1947 to 6 October 19471948: 3 May 1948 to 21 October 19481949: 24 April 1949 to 26 October 19491950: 5 May 1950 to 22 October 19501951: 21 April 1951 to 21 October 19511952: 12 April 1952 to 13 November 19521953: 29 April 1953 to 10 November 19531954: 6 May 1954 to 8 October 19541959: 4 April 1959 to 19 November 19591960: 7 March 1960 to 15 October 19601961: 10 May 1961 to 23 October 19611962: 3 May 1962 to 14 October 19621973: 31 March 1973 to 13 October 19731974: 8 May 1974 to 17 October 19741975: 17 April 1975 to 13 October 19751976: 29 April 1976 to 23 October 19761977: 8 April 1977 to 19 October 19771978: 25 April 1978 to 27 October 19781979: 24 April 1979 to 29 October 19791980: 29 April 1980 to 19 October 19801981: 19 April 1981 to 22 October 19811984: 13 May 1984 to 4 October 19841985: 5 May 1985 to 14 October 19851986: 28 April 1986 to 15 October 19861987: 12 May 1987 to 11 October 19871988: 3 May 1988 to 20 September 19881989: 12 May 1989 to 6 October 19891990: 31 May 1990 to 1 October 19901991: 26 April 1991 to 4 October 199119471951195919731977198119871991JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Hong Kong Observatory meeting 30 C (86 F).
First to last qualifying date each year at Hong Kong Observatory
YearFirst dateLast date
19471947-05-021947-10-06
19481948-05-031948-10-21
19491949-04-241949-10-26
19501950-05-051950-10-22
19511951-04-211951-10-21
19521952-04-121952-11-13
19531953-04-291953-11-10
19541954-05-061954-10-08
19591959-04-041959-11-19
19601960-03-071960-10-15
19611961-05-101961-10-23
19621962-05-031962-10-14
19731973-03-311973-10-13
19741974-05-081974-10-17
19751975-04-171975-10-13
19761976-04-291976-10-23
19771977-04-081977-10-19
19781978-04-251978-10-27
19791979-04-241979-10-29
19801980-04-291980-10-19
19811981-04-191981-10-22
19841984-05-131984-10-04
19851985-05-051985-10-14
19861986-04-281986-10-15
19871987-05-121987-10-11
19881988-05-031988-09-20
19891989-05-121989-10-06
19901990-05-311990-10-01
19911991-04-261991-10-04

Every Fixed Threshold

Fixed thresholds at Hong Kong Observatory
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days291411977114
35 C (95 F): Days11219541
90 F (32.2 C): Days2978196241
100 F (37.8 C): Days1119811
20 C (68 F): Tropical nights (min52121952186
25 C (77 F): Days with min51011954101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1947.

Download the Data

  • Data for Hong Kong Observatory threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).